{"id":5926,"date":"2025-09-23T16:22:19","date_gmt":"2025-09-23T07:22:19","guid":{"rendered":"https:\/\/sky-peace.net\/?p=5926"},"modified":"2025-09-23T16:22:19","modified_gmt":"2025-09-23T07:22:19","slug":"nw-sp-6","status":"publish","type":"post","link":"https:\/\/sky-peace.net\/certified\/nw-sp-6\/","title":{"rendered":"\u3010NW\u8a66\u9a13 \u5348\u5f8c\u5bfe\u7b56\u3011LB\u30fbDHCP\u30fbNAPT\u306a\u3069\u3001\u5fc5\u9808\u30cd\u30c3\u30c8\u30ef\u30fc\u30af\u30b5\u30fc\u30d3\u30b9\u3092\u5b8c\u5168\u7406\u89e3\uff01"},"content":{"rendered":"<p>\u3053\u308c\u307e\u3067\u306e\u8a18\u4e8b\u3067\u3001\u30cd\u30c3\u30c8\u30ef\u30fc\u30af\u306e\u57fa\u672c\u63a5\u7d9a\uff08L2\/L3\uff09\u3068\u4e3b\u8981\u30d7\u30ed\u30c8\u30b3\u30eb\u3092\u5b66\u3093\u3067\u304d\u307e\u3057\u305f\u3002\u4eca\u56de\u306f\u305d\u306e\u4e0a\u3067\u52d5\u4f5c\u3059\u308b\u300c<strong>\u30cd\u30c3\u30c8\u30ef\u30fc\u30af\u30b5\u30fc\u30d3\u30b9<\/strong>\u300d\u306b\u7126\u70b9\u3092\u5f53\u3066\u307e\u3059\u3002<\/p>\n<p>Web\u30b5\u30a4\u30c8\u306e\u5b89\u5b9a\u7a3c\u50cd\u3092\u652f\u3048\u308b<strong>\u8ca0\u8377\u5206\u6563\u88c5\u7f6e\uff08LB\uff09<\/strong>\u3001IP\u30a2\u30c9\u30ec\u30b9\u3092\u81ea\u52d5\u3067\u6255\u3044\u51fa\u3059<strong>DHCP<\/strong>\u3001\u30a4\u30f3\u30bf\u30fc\u30cd\u30c3\u30c8\u63a5\u7d9a\u306b\u4e0d\u53ef\u6b20\u306a<strong>NAPT<\/strong>\u3001\u305d\u3057\u3066\u901a\u4fe1\u3092\u4ee3\u7406\u3059\u308b<strong>\u30d7\u30ed\u30ad\u30b7\u30b5\u30fc\u30d0<\/strong>\u3002\u3053\u308c\u3089\u306f\u3001\u901a\u4fe1\u305d\u306e\u3082\u306e\u3092\u5b9f\u73fe\u3059\u308b\u308f\u3051\u3067\u306f\u3042\u308a\u307e\u305b\u3093\u304c\u3001\u73fe\u4ee3\u306e\u30cd\u30c3\u30c8\u30ef\u30fc\u30af\u3092\u52b9\u7387\u7684\u304b\u3064\u5b89\u5168\u306b\u904b\u7528\u3059\u308b\u305f\u3081\u306b\u306f\u6b20\u304b\u305b\u306a\u3044&#8221;\u7e01\u306e\u4e0b\u306e\u529b\u6301\u3061&#8221;\u3067\u3059\u3002<\/p>\n<p>\u672c\u8a18\u4e8b\u3067\u306f\u3001\u3053\u308c\u3089\u306e\u30b5\u30fc\u30d3\u30b9\u306e\u5f79\u5272\u3068\u4ed5\u7d44\u307f\u3092\u6b63\u78ba\u306b\u7406\u89e3\u3057\u3001\u5348\u5f8c\u554f\u984c\u306e\u30b7\u30ca\u30ea\u30aa\u8aad\u89e3\u529b\u3092\u5b8c\u6210\u3055\u305b\u307e\u3057\u3087\u3046\u3002<\/p>\n<h2>1. \u3010LB (\u8ca0\u8377\u5206\u6563\u88c5\u7f6e)\u3011Web\u30b5\u30a4\u30c8\u306e\u5b89\u5b9a\u7a3c\u50cd\u3092\u652f\u3048\u308b\u53f8\u4ee4\u5854<\/h2>\n<p>\u4eba\u6c17\u306eWeb\u30b5\u30a4\u30c8\u3084\u30b5\u30fc\u30d3\u30b9\u3067\u306f\u3001\u5927\u91cf\u306e\u30a2\u30af\u30bb\u30b9\u3092\u4e00\u53f0\u306e\u30b5\u30fc\u30d0\u3067\u51e6\u7406\u3059\u308b\u306e\u306f\u56f0\u96e3\u3067\u3059\u3002<strong>LB\uff08Load Balancer\u3001\u8ca0\u8377\u5206\u6563\u88c5\u7f6e\uff09<\/strong>\u306f\u3001\u8907\u6570\u306e\u30b5\u30fc\u30d0\u306b\u51e6\u7406\u3092\u632f\u308a\u5206\u3051\u308b\uff08\u8ca0\u8377\u5206\u6563\u3059\u308b\uff09\u3053\u3068\u3067\u3001\u30b7\u30b9\u30c6\u30e0\u306e\u51e6\u7406\u80fd\u529b\u3084\u53ef\u7528\u6027\u3092\u5411\u4e0a\u3055\u305b\u308b\u91cd\u8981\u306a\u88c5\u7f6e\u3067\u3059\u3002<\/p>\n<h3>\u306a\u305c\u8ca0\u8377\u5206\u6563\u304c\u5fc5\u8981\u304b\uff1f<\/h3>\n<p>\u5358\u4e00\u306e\u30b5\u30fc\u30d0\u3067\u30b5\u30fc\u30d3\u30b9\u3092\u904b\u7528\u3059\u308b\u3068\u3001\u30a2\u30af\u30bb\u30b9\u96c6\u4e2d\u6642\u306b\u6027\u80fd\u304c\u9650\u754c\u306b\u9054\u3057\u3001\u30ec\u30b9\u30dd\u30f3\u30b9\u304c\u8457\u3057\u304f\u9045\u304f\u306a\u3063\u305f\u308a\u3001\u30b5\u30fc\u30d3\u30b9\u304c\u505c\u6b62\u3057\u305f\u308a\u3059\u308b\u53ef\u80fd\u6027\u304c\u3042\u308a\u307e\u3059\u3002\u307e\u305f\u3001\u305d\u306e\u30b5\u30fc\u30d0\u304c\u6545\u969c\u3059\u308b\u3068\u30b5\u30fc\u30d3\u30b9\u5168\u4f53\u304c\u505c\u6b62\u3057\u3066\u3057\u307e\u3044\u307e\u3059\uff08<strong>\u5358\u4e00\u969c\u5bb3\u70b9<\/strong>\uff09\u3002LB\u3092\u5c0e\u5165\u3057\u3066\u30b5\u30fc\u30d0\u3092\u8907\u6570\u53f0\u69cb\u6210\u306b\u3059\u308b\u3053\u3068\u3067\u3001\u3053\u308c\u3089\u306e\u30ea\u30b9\u30af\u3092\u56de\u907f\u3067\u304d\u307e\u3059\u3002<\/p>\n<h3>\u8ca0\u8377\u5206\u6563\u306e\u4ee3\u8868\u7684\u306a\u65b9\u5f0f<\/h3>\n<p>LB\u306b\u306f\u3001\u901a\u4fe1\u306e\u3069\u306e\u5c64\u3092\u898b\u3066\u632f\u308a\u5206\u3051\u3092\u5224\u65ad\u3059\u308b\u304b\u306b\u3088\u3063\u3066\u3001\u3044\u304f\u3064\u304b\u306e\u7a2e\u985e\u304c\u3042\u308a\u307e\u3059\u3002<\/p>\n<ul>\n<li><strong>L4 LB<\/strong>: \u30c8\u30e9\u30f3\u30b9\u30dd\u30fc\u30c8\u5c64\uff08TCP\/UDP\uff09\u306e\u60c5\u5831\u3001\u4e3b\u306b\u5b9b\u5148IP\u30a2\u30c9\u30ec\u30b9\u3068\u30dd\u30fc\u30c8\u756a\u53f7\u3092\u898b\u3066\u30c8\u30e9\u30d5\u30a3\u30c3\u30af\u3092\u5206\u6563\u3057\u307e\u3059\u3002\u9ad8\u901f\u306b\u52d5\u4f5c\u3057\u307e\u3059\u304c\u3001\u901a\u4fe1\u306e\u4e2d\u8eab\u307e\u3067\u306f\u898b\u307e\u305b\u3093\u3002<\/li>\n<li><strong>L7 LB<\/strong>: \u30a2\u30d7\u30ea\u30b1\u30fc\u30b7\u30e7\u30f3\u5c64\u306e\u60c5\u5831\u3001\u4f8b\u3048\u3070HTTP\u30d8\u30c3\u30c0\u3084URL\u3092\u898b\u3066\u3001\u3088\u308a\u9ad8\u5ea6\u306a\u632f\u308a\u5206\u3051\u3092\u884c\u3044\u307e\u3059\u3002\u300c<code>\/images\/<\/code>\u3078\u306e\u30a2\u30af\u30bb\u30b9\u306f\u753b\u50cf\u30b5\u30fc\u30d0\u3078\u300d\u300c<code>\/video\/<\/code>\u3078\u306e\u30a2\u30af\u30bb\u30b9\u306f\u52d5\u753b\u30b5\u30fc\u30d0\u3078\u300d\u3068\u3044\u3063\u305f\u67d4\u8edf\u306a\u5236\u5fa1\u304c\u53ef\u80fd\u3067\u3059\u3002<\/li>\n<\/ul>\n<h3>\u5b66\u7fd2\u306e\u30dd\u30a4\u30f3\u30c8\uff1a\u30d8\u30eb\u30b9\u30c1\u30a7\u30c3\u30af\u3068\u30bb\u30c3\u30b7\u30e7\u30f3\u7dad\u6301<\/h3>\n<p>LB\u306e\u91cd\u8981\u306a\u6a5f\u80fd\u3068\u3057\u3066\u3001\u4ee5\u4e0b\u306e2\u3064\u306f\u5fc5\u305a\u62bc\u3055\u3048\u3066\u304a\u304d\u307e\u3057\u3087\u3046\u3002<\/p>\n<ul>\n<li><strong>\u30d8\u30eb\u30b9\u30c1\u30a7\u30c3\u30af<\/strong>: LB\u306f\u5b9a\u671f\u7684\u306b\u914d\u4e0b\u306e\u30b5\u30fc\u30d0\u304c\u6b63\u5e38\u306b\u7a3c\u50cd\u3057\u3066\u3044\u308b\u304b\u3092\u76e3\u8996\u3057\u307e\u3059\u3002\u5fdc\u7b54\u304c\u306a\u3044\u30b5\u30fc\u30d0\u3092\u6545\u969c\u3068\u5224\u65ad\u3057\u3001\u81ea\u52d5\u7684\u306b\u632f\u308a\u5206\u3051\u5bfe\u8c61\u304b\u3089\u5916\u3059\u3053\u3068\u3067\u3001\u30b5\u30fc\u30d3\u30b9\u5168\u4f53\u306e\u53ef\u7528\u6027\u3092\u4fdd\u3061\u307e\u3059\u3002<\/li>\n<li><strong>\u30bb\u30c3\u30b7\u30e7\u30f3\u7dad\u6301<\/strong>: \u30ed\u30b0\u30a4\u30f3\u304c\u5fc5\u8981\u306aEC\u30b5\u30a4\u30c8\u306a\u3069\u3067\u3001\u30e6\u30fc\u30b6\u30fc\u306e\u4e00\u9023\u306e\u901a\u4fe1\u304c\u5e38\u306b\u540c\u3058\u30b5\u30fc\u30d0\u306b\u632f\u308a\u5206\u3051\u3089\u308c\u308b\u3088\u3046\u306b\u3059\u308b\u4ed5\u7d44\u307f\u3067\u3059\u3002\u9001\u4fe1\u5143IP\u30a2\u30c9\u30ec\u30b9\u3084Cookie\u3092\u5229\u7528\u3057\u3066\u5b9f\u73fe\u3057\u307e\u3059\u3002<\/li>\n<\/ul>\n<hr \/>\n<h2>2. \u3010DHCP\/DHCPv6\u3011IP\u30a2\u30c9\u30ec\u30b9\u81ea\u52d5\u8a2d\u5b9a\u306e\u4ed5\u7d44\u307f<\/h2>\n<p>\u30cd\u30c3\u30c8\u30ef\u30fc\u30af\u306bPC\u3092\u63a5\u7d9a\u3059\u308b\u305f\u3073\u306b\u3001\u624b\u52d5\u3067IP\u30a2\u30c9\u30ec\u30b9\u3084\u30c7\u30d5\u30a9\u30eb\u30c8\u30b2\u30fc\u30c8\u30a6\u30a7\u30a4\u3092\u8a2d\u5b9a\u3059\u308b\u306e\u306f\u975e\u5e38\u306b\u624b\u9593\u304c\u304b\u304b\u308a\u3001\u8a2d\u5b9a\u30df\u30b9\u306e\u539f\u56e0\u306b\u3082\u306a\u308a\u307e\u3059\u3002<strong>DHCP (Dynamic Host Configuration Protocol)<\/strong>\u306f\u3001\u3053\u308c\u3089\u306e\u30cd\u30c3\u30c8\u30ef\u30fc\u30af\u8a2d\u5b9a\u60c5\u5831\u3092\u30af\u30e9\u30a4\u30a2\u30f3\u30c8\u306b<strong>\u81ea\u52d5\u7684\u306b\u5272\u308a\u5f53\u3066\u308b<\/strong>\u305f\u3081\u306e\u30d7\u30ed\u30c8\u30b3\u30eb\u3067\u3059\u3002<\/p>\n<h3>DHCP\u306e\u57fa\u672c\u30b7\u30fc\u30b1\u30f3\u30b9<\/h3>\n<p>DHCP\u306b\u3088\u308bIP\u30a2\u30c9\u30ec\u30b9\u306e\u5272\u308a\u5f53\u3066\u306f\u3001<strong>DORA<\/strong>\u3068\u547c\u3070\u308c\u308b4\u30b9\u30c6\u30c3\u30d7\u306e\u30d7\u30ed\u30bb\u30b9\u3067\u884c\u308f\u308c\u307e\u3059\u3002<\/p>\n<ol>\n<li><strong>Discover<\/strong>: \u30af\u30e9\u30a4\u30a2\u30f3\u30c8\u304c\u3001\u30cd\u30c3\u30c8\u30ef\u30fc\u30af\u4e0a\u306eDHCP\u30b5\u30fc\u30d0\u3092\u63a2\u3059\u305f\u3081\u306b\u30d6\u30ed\u30fc\u30c9\u30ad\u30e3\u30b9\u30c8\u8981\u6c42\u3092\u9001\u4fe1\u3057\u307e\u3059\u3002\u300c\u8ab0\u304bIP\u30a2\u30c9\u30ec\u30b9\u3092\u8cb8\u3057\u3066\u304f\u3060\u3055\u3044\uff01\u300d<\/li>\n<li><strong>Offer<\/strong>: \u8981\u6c42\u3092\u53d7\u4fe1\u3057\u305fDHCP\u30b5\u30fc\u30d0\u304c\u3001\u30af\u30e9\u30a4\u30a2\u30f3\u30c8\u306b\u8cb8\u3057\u51fa\u3059IP\u30a2\u30c9\u30ec\u30b9\u306a\u3069\u306e\u8a2d\u5b9a\u60c5\u5831\u3092\u63d0\u793a\u3057\u307e\u3059\u3002\u300c\u3053\u306e\u30a2\u30c9\u30ec\u30b9\u306f\u3044\u304b\u304c\u3067\u3059\u304b\uff1f\u300d<\/li>\n<li><strong>Request<\/strong>: \u30af\u30e9\u30a4\u30a2\u30f3\u30c8\u306f\u3001\u63d0\u793a\u3055\u308c\u305f\u60c5\u5831\u3092\u4f7f\u7528\u3057\u305f\u3044\u65e8\u3092DHCP\u30b5\u30fc\u30d0\u306b\u901a\u77e5\u3057\u307e\u3059\u3002\u300c\u3042\u308a\u304c\u3068\u3046\u3054\u3056\u3044\u307e\u3059\u3002\u305d\u306e\u30a2\u30c9\u30ec\u30b9\u3092\u4f7f\u3044\u307e\u3059\u3002\u300d<\/li>\n<li><strong>Ack (Acknowledgement)<\/strong>: DHCP\u30b5\u30fc\u30d0\u304c\u8981\u6c42\u3092\u6b63\u5f0f\u306b\u8a31\u53ef\u3057\u3001IP\u30a2\u30c9\u30ec\u30b9\u306e\u8cb8\u3057\u51fa\u3057\uff08\u30ea\u30fc\u30b9\uff09\u304c\u5b8c\u4e86\u3057\u307e\u3059\u3002\u300c\u627f\u77e5\u3057\u307e\u3057\u305f\u3002\u3069\u3046\u305e\u304a\u4f7f\u3044\u304f\u3060\u3055\u3044\u3002\u300d<\/li>\n<\/ol>\n<h3>DHCP\u30ea\u30ec\u30fc\u30a8\u30fc\u30b8\u30a7\u30f3\u30c8\u306e\u5f79\u5272<\/h3>\n<p>DHCP\u306eDiscover\u30e1\u30c3\u30bb\u30fc\u30b8\u306f\u30d6\u30ed\u30fc\u30c9\u30ad\u30e3\u30b9\u30c8\u306e\u305f\u3081\u3001\u901a\u5e38\u306f\u30eb\u30fc\u30bf\u3092\u8d8a\u3048\u3066\u4ed6\u306e\u30cd\u30c3\u30c8\u30ef\u30fc\u30af\u30bb\u30b0\u30e1\u30f3\u30c8\u306b\u306f\u5c4a\u304d\u307e\u305b\u3093\u3002\u3057\u304b\u3057\u3001\u5404\u30bb\u30b0\u30e1\u30f3\u30c8\u306bDHCP\u30b5\u30fc\u30d0\u3092\u7f6e\u304f\u306e\u306f\u975e\u52b9\u7387\u3067\u3059\u3002\u305d\u3053\u3067\u3001\u30eb\u30fc\u30bf\u306a\u3069\u306b<strong>DHCP\u30ea\u30ec\u30fc\u30a8\u30fc\u30b8\u30a7\u30f3\u30c8<\/strong>\u306e\u6a5f\u80fd\u3092\u6301\u305f\u305b\u308b\u3053\u3068\u3067\u3001\u7279\u5b9a\u306eDHCP\u30b5\u30fc\u30d0\u306b\u30af\u30e9\u30a4\u30a2\u30f3\u30c8\u306e\u8981\u6c42\u3092\u4e2d\u7d99\uff08\u30ea\u30ec\u30fc\uff09\u3055\u305b\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002\u3053\u308c\u306b\u3088\u308a\u30011\u53f0\u306eDHCP\u30b5\u30fc\u30d0\u3067\u8907\u6570\u306e\u30cd\u30c3\u30c8\u30ef\u30fc\u30af\u30bb\u30b0\u30e1\u30f3\u30c8\u3092\u7ba1\u7406\u3067\u304d\u307e\u3059\u3002<\/p>\n<h3>\u5b66\u7fd2\u306e\u30dd\u30a4\u30f3\u30c8\uff1aDHCP Snooping<\/h3>\n<p>\u30cd\u30c3\u30c8\u30ef\u30fc\u30af\u5185\u306b\u4e0d\u6b63\u306aDHCP\u30b5\u30fc\u30d0\u304c\u8a2d\u7f6e\u3055\u308c\u308b\u3068\u3001\u30af\u30e9\u30a4\u30a2\u30f3\u30c8\u306b\u507d\u306eIP\u30a2\u30c9\u30ec\u30b9\u3084DNS\u30b5\u30fc\u30d0\u60c5\u5831\u3092\u5272\u308a\u5f53\u3066\u3001\u901a\u4fe1\u3092\u76d7\u8074\u3059\u308b\u306a\u3069\u306e\u653b\u6483\u304c\u53ef\u80fd\u306b\u306a\u308a\u307e\u3059\u3002\u3053\u308c\u3092\u9632\u3050\u30bb\u30ad\u30e5\u30ea\u30c6\u30a3\u6a5f\u80fd\u304c<strong>DHCP Snooping<\/strong>\u3067\u3059\u3002\u30b9\u30a4\u30c3\u30c1\u306e\u6a5f\u80fd\u3067\u3001\u4fe1\u983c\u3067\u304d\u308bDHCP\u30b5\u30fc\u30d0\u304c\u63a5\u7d9a\u3055\u308c\u305f\u30dd\u30fc\u30c8\u4ee5\u5916\u304b\u3089\u306eDHCP Offer\u30e1\u30c3\u30bb\u30fc\u30b8\u3092\u30d6\u30ed\u30c3\u30af\u3057\u307e\u3059\u3002<\/p>\n<h2>3. \u3010NAPT\/NAT\u3011IPv4\u30a2\u30c9\u30ec\u30b9\u67af\u6e07\u554f\u984c\u3092\u89e3\u6c7a\u3059\u308b\u6280\u8853<\/h2>\n<p>\u793e\u5185LAN\u306a\u3069\u306e\u30d7\u30e9\u30a4\u30d9\u30fc\u30c8\u30cd\u30c3\u30c8\u30ef\u30fc\u30af\u5185\u3067\u4f7f\u308f\u308c\u308b<strong>\u30d7\u30e9\u30a4\u30d9\u30fc\u30c8IP\u30a2\u30c9\u30ec\u30b9<\/strong>\u3068\u3001\u30a4\u30f3\u30bf\u30fc\u30cd\u30c3\u30c8\u4e0a\u3067\u4f7f\u308f\u308c\u308b<strong>\u30b0\u30ed\u30fc\u30d0\u30ebIP\u30a2\u30c9\u30ec\u30b9<\/strong>\u3092\u76f8\u4e92\u306b\u5909\u63db\u3059\u308b\u6280\u8853\u304c<strong>NAT\uff08Network Address Translation\uff09<\/strong>\u3067\u3059\u3002\u3053\u308c\u306b\u3088\u308a\u3001\u9650\u3089\u308c\u305f\u30b0\u30ed\u30fc\u30d0\u30ebIP\u30a2\u30c9\u30ec\u30b9\u3092\u591a\u304f\u306e\u7aef\u672b\u3067\u5171\u6709\u3067\u304d\u3001IPv4\u30a2\u30c9\u30ec\u30b9\u306e\u67af\u6e07\u554f\u984c\u306b\u5bfe\u5fdc\u3057\u3066\u3044\u307e\u3059\u3002<\/p>\n<h3>NAT\u3068NAPT\u306e\u9055\u3044<\/h3>\n<p>NAT\u3068NAPT\u306f\u3057\u3070\u3057\u3070\u6df7\u540c\u3055\u308c\u307e\u3059\u304c\u3001\u305d\u306e\u5909\u63db\u65b9\u5f0f\u306b\u306f\u660e\u78ba\u306a\u9055\u3044\u304c\u3042\u308a\u307e\u3059\u3002<\/p>\n<ul>\n<li><strong>NAT (Basic NAT)<\/strong>: \u30d7\u30e9\u30a4\u30d9\u30fc\u30c8IP\u30a2\u30c9\u30ec\u30b9\u3068\u30b0\u30ed\u30fc\u30d0\u30ebIP\u30a2\u30c9\u30ec\u30b9\u3092<strong>1\u5bfe1<\/strong>\u3067\u5909\u63db\u3057\u307e\u3059\u3002\u3053\u306e\u65b9\u5f0f\u3067\u306f\u3001\u540c\u6642\u306b\u30a4\u30f3\u30bf\u30fc\u30cd\u30c3\u30c8\u3078\u63a5\u7d9a\u3067\u304d\u308b\u7aef\u672b\u306e\u6570\u306f\u3001\u5229\u7528\u53ef\u80fd\u306a\u30b0\u30ed\u30fc\u30d0\u30ebIP\u30a2\u30c9\u30ec\u30b9\u306e\u6570\u306b\u5236\u9650\u3055\u308c\u307e\u3059\u3002<\/li>\n<li><strong>NAPT (Network Address Port Translation)<\/strong>: IP\u30a2\u30c9\u30ec\u30b9\u306b\u52a0\u3048\u3066\u3001<strong>TCP\/UDP\u306e\u30dd\u30fc\u30c8\u756a\u53f7<\/strong>\u3082\u4f7f\u3063\u3066\u5909\u63db\u3057\u307e\u3059\u3002\u3053\u308c\u306b\u3088\u308a\u3001<strong>1\u3064\u306e\u30b0\u30ed\u30fc\u30d0\u30ebIP\u30a2\u30c9\u30ec\u30b9<\/strong>\u3092\u3001\u7570\u306a\u308b\u30dd\u30fc\u30c8\u756a\u53f7\u3092\u5272\u308a\u5f53\u3066\u308b\u3053\u3068\u3067<strong>\u591a\u6570\u306e\u7aef\u672b<\/strong>\u304c\u5171\u6709\u3067\u304d\u307e\u3059\u3002\u5bb6\u5ead\u7528\u30eb\u30fc\u30bf\u306a\u3069\u3067\u4e00\u822c\u7684\u306b\u4f7f\u308f\u308c\u3066\u3044\u308b\u306e\u306f\u3001\u3053\u306eNAPT\u3067\u3042\u308a\u3001\u300c<strong>IP\u30de\u30b9\u30ab\u30ec\u30fc\u30c9<\/strong>\u300d\u3068\u3082\u547c\u3070\u308c\u307e\u3059\u3002<\/li>\n<\/ul>\n<h3>NAPT\u306e\u5909\u63db\u30c6\u30fc\u30d6\u30eb<\/h3>\n<p>NAPT\u30eb\u30fc\u30bf\u306f\u3001\u5185\u90e8\u304b\u3089\u306e\u901a\u4fe1\u304c\u767a\u751f\u3059\u308b\u3068\u3001\u300c\u9001\u4fe1\u5143\u30d7\u30e9\u30a4\u30d9\u30fc\u30c8IP\u30a2\u30c9\u30ec\u30b9\uff0b\u30dd\u30fc\u30c8\u756a\u53f7\u300d\u3068\u300c\u5909\u63db\u5f8c\u306e\u30b0\u30ed\u30fc\u30d0\u30ebIP\u30a2\u30c9\u30ec\u30b9\uff0b\u30dd\u30fc\u30c8\u756a\u53f7\u300d\u306e\u5bfe\u5fdc\u3092<strong>\u5909\u63db\u30c6\u30fc\u30d6\u30eb<\/strong>\u306b\u8a18\u9332\u3057\u307e\u3059\u3002\u30a4\u30f3\u30bf\u30fc\u30cd\u30c3\u30c8\u304b\u3089\u623b\u3063\u3066\u304d\u305f\u5fdc\u7b54\u30d1\u30b1\u30c3\u30c8\u306f\u3001\u3053\u306e\u30c6\u30fc\u30d6\u30eb\u3092\u53c2\u7167\u3059\u308b\u3053\u3068\u3067\u3001\u3069\u306e\u7aef\u672b\u5b9b\u306e\u901a\u4fe1\u304b\u3092\u6b63\u78ba\u306b\u5224\u65ad\u3057\u3001\u9069\u5207\u306b\u632f\u308a\u5206\u3051\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002<\/p>\n<h3>\u5b66\u7fd2\u306e\u30dd\u30a4\u30f3\u30c8\uff1aCGN\u3068NAT444<\/h3>\n<p>\u8fd1\u5e74\u3067\u306f\u3001ISP\u5074\u3067\u3082\u5927\u898f\u6a21\u306aNAPT\uff08<strong>CGN<\/strong>\u307e\u305f\u306f<strong>LSN<\/strong>\uff09\u3092\u5c0e\u5165\u3057\u3001\u8907\u6570\u306e\u5951\u7d04\u8005\u3067\u4e00\u3064\u306e\u30b0\u30ed\u30fc\u30d0\u30ebIP\u30a2\u30c9\u30ec\u30b9\u3092\u5171\u6709\u3059\u308b\u30b1\u30fc\u30b9\u304c\u5897\u3048\u3066\u3044\u307e\u3059\u3002\u3053\u306e\u7d50\u679c\u3001\u30e6\u30fc\u30b6\u5b85\u5185\u306eNAPT\u3068ISP\u306eCGN\u3067\u30012\u6bb5\u968e\u306eNAPT\uff08<strong>NAT444<\/strong>\uff09\u304c\u884c\u308f\u308c\u308b\u3053\u3068\u304c\u3042\u308a\u307e\u3059\u3002\u3053\u306e\u69cb\u6210\u304c\u306a\u305c\u5fc5\u8981\u3067\u3001\u30aa\u30f3\u30e9\u30a4\u30f3\u30b2\u30fc\u30e0\u3084\u30b5\u30fc\u30d0\u516c\u958b\u306a\u3069\u306b\u3069\u306e\u3088\u3046\u306a\u5f71\u97ff\u3092\u4e0e\u3048\u308b\u304b\u3092\u7406\u89e3\u3057\u3066\u304a\u304f\u3053\u3068\u304c\u91cd\u8981\u3067\u3059\u3002<\/p>\n<p><!-- CGN\/LSN\u30fbNAT44 \u30e1\u30e2\uff08WordPress\u8cbc\u308a\u4ed8\u3051\u7528\uff09 --><\/p>\n<div class=\"note-box\" style=\"border:1px solid #ddd;padding:12px;border-radius:6px;margin:16px 0;font-size:0.95em;line-height:1.7;\">\n<p><strong>\u76ee\u7684\uff1a<\/strong>IPv4\u67af\u6e07\u3078\u306e\u5bfe\u51e6\u3068\u3057\u3066\u3001\u9650\u3089\u308c\u305f\u30b0\u30ed\u30fc\u30d0\u30ebIPv4\u3092\u591a\u6570\u30e6\u30fc\u30b6\u3067\u5171\u6709\u3057\u3064\u3064\u901a\u4fe1\u3092\u7d99\u7d9a\u3059\u308b\u3002<\/p>\n<p><strong>\u7528\u8a9e\u6574\u7406<\/strong><\/p>\n<ul>\n<li><strong>NAPT<\/strong>\uff1a\u30a2\u30c9\u30ec\u30b9\uff0b\u30dd\u30fc\u30c8\u756a\u53f7\u3092\u5909\u63db\u3057\u3001\u591a\u6570\u7aef\u672b\u3092\u5c11\u6570\u306e\u30b0\u30ed\u30fc\u30d0\u30ebIP\u3067\u53ce\u5bb9\u3002<\/li>\n<li><strong>CGN \/ LSN<\/strong>\uff1aISP\u5074\u3067\u884c\u3046\u5927\u898f\u6a21NAPT\u3002\u52a0\u5165\u8005\u5b85\u306eNAPT\u3068\u7d44\u307f\u5408\u308f\u3055\u308a<strong>\u4e8c\u91cdNAT<\/strong>\u306b\u306a\u308a\u3084\u3059\u3044\u3002<\/li>\n<li><strong>NAT44<\/strong>\uff1a\u300cIPv4 \u2192 IPv4\u300d\u306e\u30a2\u30c9\u30ec\u30b9\u5909\u63db\u306e\u7dcf\u79f0\u3002\u5bb6\u5ead\u7528\u30eb\u30fc\u30bf\u306eNAPT\u3084CGN\/LSN\u3082\u542b\u307e\u308c\u308b\u3002<br \/>\n      <span style=\"color:#666;\">\u203b\u300cNT44\u300d\u3068\u8868\u8a18\u3055\u308c\u308b\u3053\u3068\u3082\u3042\u308b\u304c\u4e00\u822c\u7684\u306b\u306f<strong>NAT44<\/strong>\u3002<\/span>\n    <\/li>\n<\/ul>\n<p><strong>\u5178\u578b\u30c8\u30dd\u30ed\u30b8\uff08\u7c21\u6613\u30c6\u30ad\u30b9\u30c8\u56f3\uff09<\/strong><\/p>\n<pre style=\"background:#fafafa;border:1px solid #eee;padding:8px;border-radius:4px;white-space:pre-wrap;\">\n\u5b85\u5185\u7aef\u672b 192.168.1.2:12345\n   \u2193\uff08\u5b85\u5185NAPT\uff09\n\u5b85\u5185\u30eb\u30fc\u30bf 10.0.0.2:50001\n   \u2193\uff08ISP\u306eCGN\/LSN\u3067NAPT\uff09\n\u30b0\u30ed\u30fc\u30d0\u30eb 203.0.113.1:40001 \u2192 \u30a4\u30f3\u30bf\u30fc\u30cd\u30c3\u30c8\n  <\/pre>\n<p>\u203b ISP\u5185\u306e\u52a0\u5165\u8005\u5411\u3051\u30a2\u30c9\u30ec\u30b9\u3067 <code>100.64.0.0\/10<\/code>\uff08CGNAT\u7528\uff09\u3092\u4f7f\u3046\u3053\u3068\u304c\u591a\u3044\u3002<\/p>\n<p><strong>\u30e1\u30ea\u30c3\u30c8\u3068\u30c7\u30e1\u30ea\u30c3\u30c8<\/strong><\/p>\n<table style=\"width:100%;border-collapse:collapse;margin-top:6px;font-size:0.95em;\">\n<tr>\n<th style=\"border:1px solid #ddd;padding:6px;background:#fafafa;\">\u89b3\u70b9<\/th>\n<th style=\"border:1px solid #ddd;padding:6px;background:#fafafa;\">\u30e1\u30ea\u30c3\u30c8<\/th>\n<th style=\"border:1px solid #ddd;padding:6px;background:#fafafa;\">\u30c7\u30e1\u30ea\u30c3\u30c8<\/th>\n<\/tr>\n<tr>\n<td style=\"border:1px solid #ddd;padding:6px;\">IPv4\u8cc7\u6e90<\/td>\n<td style=\"border:1px solid #ddd;padding:6px;\">\u5c11\u6570\u306e\u30b0\u30ed\u30fc\u30d0\u30ebIPv4\u3067\u591a\u6570\u30e6\u30fc\u30b6\u3092\u53ce\u5bb9<\/td>\n<td style=\"border:1px solid #ddd;padding:6px;\">\u56fa\u6709\u30b0\u30ed\u30fc\u30d0\u30ebIP\u306e\u4ed8\u4e0e\u304c\u56f0\u96e3\uff08\u56fa\u5b9aIP\u8981\u4ef6\u306b\u4e0d\u5411\u304d\uff09<\/td>\n<\/tr>\n<tr>\n<td style=\"border:1px solid #ddd;padding:6px;\">\u758e\u901a\u6027<\/td>\n<td style=\"border:1px solid #ddd;padding:6px;\">\u30a2\u30a6\u30c8\u30d0\u30a6\u30f3\u30c9\u4e2d\u5fc3\u306e\u901a\u4fe1\u306f\u5bb9\u6613<\/td>\n<td style=\"border:1px solid #ddd;padding:6px;\">\u30a4\u30f3\u30d0\u30a6\u30f3\u30c9\u901a\u4fe1\u4e0d\u53ef\u3001P2P\/VoIP\/\u30b2\u30fc\u30e0\u306b\u5f71\u97ff<\/td>\n<\/tr>\n<tr>\n<td style=\"border:1px solid #ddd;padding:6px;\">\u904b\u7528\u30fb\u8ffd\u8de1<\/td>\n<td style=\"border:1px solid #ddd;padding:6px;\">IPv4\u6d88\u8cbb\u6291\u5236\u3067\u904b\u7528\u7d99\u7d9a\u53ef\u80fd<\/td>\n<td style=\"border:1px solid #ddd;padding:6px;\">\u30ed\u30b0\u306fIP\uff0b\u30dd\u30fc\u30c8\uff0b\u6642\u523b\u3067\u8a18\u9332\u5fc5\u9808\u3001\u898f\u6a21\u30fb\u4fdd\u5168\u30b3\u30b9\u30c8\u5897<\/td>\n<\/tr>\n<tr>\n<td style=\"border:1px solid #ddd;padding:6px;\">\u30d1\u30d5\u30a9\u30fc\u30de\u30f3\u30b9<\/td>\n<td style=\"border:1px solid #ddd;padding:6px;\">\u5197\u9577\u5316\u3067\u9ad8\u53ef\u7528\u6027\u69cb\u6210\u53ef\u80fd<\/td>\n<td style=\"border:1px solid #ddd;padding:6px;\">CGN\u88c5\u7f6e\u304c\u30dc\u30c8\u30eb\u30cd\u30c3\u30af\uff0f\u5358\u4e00\u969c\u5bb3\u70b9\u306b\u306a\u308a\u5f97\u308b<\/td>\n<\/tr>\n<\/table>\n<p><strong>\u5b66\u7fd2\u8981\u70b9<\/strong><\/p>\n<ul>\n<li><strong>NAT44<\/strong>\uff1dIPv4\u2192IPv4\u5909\u63db\u306e\u7dcf\u79f0\u3002<\/li>\n<li><strong>CGN\/LSN<\/strong>\uff1dISP\u30ec\u30d9\u30eb\u306e\u5927\u898f\u6a21NAPT\u3002\u4e8c\u91cdNAT\u30fb\u30ed\u30b0\u7ba1\u7406\u30fb\u30a2\u30d7\u30ea\u4e92\u63db\u304c\u8ad6\u70b9\u3002<\/li>\n<li>\u6839\u672c\u89e3\u6c7a\u306f<strong>\u30cd\u30a4\u30c6\u30a3\u30d6IPv6<\/strong>\u306e\u666e\u53ca\u3002<\/li>\n<\/ul>\n<\/div>\n<p><!-- \/CGN\/LSN\u30fbNAT44 \u30e1\u30e2 --><\/p>\n<h2>4. 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